How To Keep Image Aspect Ratio Inside A %width Div?

I'm sorry to ask this again, but my search has not revealed anything that I have been able to implement. I have an image inside a div with the following styles:

.grid_6 {
    width: 50%;
    height:100px;
    overflow:hidden;
}
.thumbimg {
    display: block;
    width:100%;
    height:auto;
}

Solution 2:

Is this what you want?

.grid_6 {overflow: hidden; }
.thumbimg {
    height: 100px;
    width: auto;
}

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